What causes armpit pain? Related conditions and treatments
The Checkup by Singlecare
JANUARY 11, 2024
Read more about treatments for skin tags , hidradenitis suppurativa , and shingles. Swollen lymph nodes A viral infection like mononucleosis or the flu can lead to swollen lymph nodes under the arm, which can be tender or even a little painful. The lymph nodes tend to swell when they react to an infection or a vaccine.
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